| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.81 | 34 |
| 2015 | 1.65 | 44 |
| 2014 | 1.31 | 59 |
| 2013 | 0.6 | 97 |
| 2012 | 0.43 | 109 |
| 2011 | 0.63 | 97 |
| 2010 | 0.99 | 79 |
| 2009 | 0.87 | 87 |
| 2008 | 0.66 | 102 |
| 2007 | 0.75 | 97 |
| 2006 | 1.03 | 83 |
| 2005 | 0.94 | 88 |
| 2004 | 1.3 | 68 |
| 2003 | 1.26 | 67 |
| 2002 | 0.78 | 93 |
| 2001 | -.02 | 135 |
| 2000 | 0.14 | 127 |
| 1999 | 0.08 | 130 |
| 1998 | 0.45 | 111 |
| 1997 | 0.87 | 93 |
| 1996 | 0.98 | 87 |
| 1995 | 0.79 | 98 |
| 1994 | 0.65 | 102 |
| 1993 | 0.47 | 117 |
| 1992 | 0.37 | 121 |
| 1991 | 3.59 | 9 |
| 1990 | -.61 | 164 |
| 1989 | -1.04 | 172 |
| 1988 | -1.26 | 177 |
| 1987 | -.66 | 161 |
| 1986 | -.68 | 166 |